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Abstract Detail


MSA - Ecology/Pathology

Kjoller, Rasmus [1], Clemmensen, Karina [2], Michelsen, Anders [1], Nilsson, Lars-Ola [3].

Ectomycorrhizal fungal community composition and preference for three 15N-substrates along a short nitrogen deposition gradient.

Within forests exposed to high atmospheric nitrogen deposition, short N-deposition gradients may form – the N throughfall is highest at the forest front and decreases towards the interior of the forest. A spruce-associated ectomycorrhizal community showed significant changes in the species composition and a 100-fold increase in the production of external mycelia over such a short N-deposition gradient.
In order to test for functional shifts between the ectomycorrhizal communities at three distances along the gradient, equimolar mixtures of glutamic acid, ammonium and nitrate, with one N form labelled with 15N at a time, were applied either directly to the soil or to sand-filled in-growth mesh bags. Soil, roots and mycelia were sampled 24 h later and data are currently being gathered. The first available results show that: 1) most of the applied 15N stayed within the soil volume sampled 2) glutamic acid was taken up at least partly in intact form by ectomycorrhizal mycelia and roots and 3) mycelia generally showed the preference pattern: ammonium>glutamic acid>nitrate irrespective of position along the N gradient.


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1 - University of Copenhagen, Department of Biology, Oster Farimagsgade 2D, Copenhagen K, 1353 , Denmark
2 - Swedish Agricultural University, Forest Mycology and Pathology, Ulls väg 26A, Uppsala, 750 07 , Sweden
3 - University of Copenhagen, Forest & Landscape , Horsholm Kongevej 11 , Horsholm, 2970 , Denmark

Keywords:
ectomycorrhizal fungi
Nitrogen
15N
Picea abies.

Presentation Type: Oral Paper:Papers for Topics
Session: 52
Location: Cottonwood B/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 1:45 PM
Number: 52002
Abstract ID:536


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